Syringe



(No Model.)

J. A. DUNN.

SYRINGE.

No. 388,029. Patented Aug. 21, 1888.

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UNllE STATES J. AUSTIN DUNN, OF CHICAGO, lLLlNOlS.

SYRINGE.

EPECIPIOATION forming part of Letters Patent No.

388,029, dated August 21, 1888.

A pplicaiiou lilcd October 29., 1887. Serial No. 153,154. (No model.)

.7 0 (ZZZ whom, it may concern.-

Be it known that I, J. AUSTIN DUNN, a citi zen of the United States,residing at Chicago, in the county of (look and State of Illinois, haveinvented a ccrtai n new and useful Syringe, of which the following is aspecification.

Myinvention relates to medicinal syringes, such as are used forintroducing medicines into cavities in the body, particularly thecavities in the teeth, about the eyes, &c., and also such syringes asare used to introduce medicines into the flesh and under the skin andthe like.

The object of my invention is to provide such a syringe with changingand adjusting the projecting needle or point at will. These Obj by meansof the device illustrated in the aceonipanying drawings, whcrein- Figure1 is a sectional view through my device with the parts separated fromeach other and the needle removed. Fig. 2 is a similar view of amodification. Fig. 3 is a side View of the needle with the packing-head.Fig. is a modification of the same with part of the needle broken away.

Like parts are indicated by the same letter in all the figures.

A is a compression-bulb adapted to contain the medicine to he used.

B is ahead, of metal or other suitable material, which is forced intothe end of the comprcssioirbnlb. C is a conical cavity in the same,which terminates in the conduit D, which passes out through thescrew-threaded projec tion E.

F is a packing-collar about against the flange l).

G is a thickened the compressionbulb to more securely hold it on thehead.

J is a screw-threaded conneetingpiccc K, and it is adapted to receivethe screw-threadcd portion L is a channel through K, which registerswith the channel I). Itterminatesin the l'un nel'shapcd cavity M in theprojecting portion N, the outer portion of which is screw-threaded topass into the apertureP of the tip 0.

' point S, and is in a line with the E and bearing tip may be terminatedin the provided with channels L the channel It and D.

edge about the mouth of eavityin the end of T is a hollow needle havingthe discharge aperture U at one end and at the other the head V, adaptedto be received into the funuel'shapcd apcrtn re M. This head V is shownalso in Fig. 4, where it is combined with an elastic collar, \V. Thehead V may he made of any desired material,- bnt I prcfrrubberor someelastic material. I t has a central aperture through which the needle 1passes.

The device is put together in the following manner: The screw-threadedprojection E is screwed into the scrcw-thrcznlcd aperture J, where atightjoiut is made by means of the washer F, or otherwise. The needle '1is then passed through the channel ll, thehcad Vresting in thefunnelshaped cavity M. By then screwing the head N into the aperture Pthe parts of the device are all brought together to make a continuoussyringe.

In Fig. 2 a modification is shew-n whereby the part K is substantiallydispensed with. A is a compressionbulb for holding the medicine; B K,the combined head-piece and c0nnection; L, the channel; M,thel'unnclshaped aperture; 0', the conical aperture opening into thehull) A,- N, the threaded projection on K; G, the thickened edge of thebulb A.

The piece 0 and needle T are applied to the modification shown in Fig.2, as above de scribed.

The use and operation of my invention are as follows: The several partshaving been securely screwed together by applying a little additionalpressure to turn the part 0 on the part N, the elastic head V, or, i fsuch head is not elastic, the elastic washer W, is pressed against thesides of the cavity M, and thus a tightjoint or connection is madebetween the hollow needle and the channel L l), which leads into theinterior of the compressiozrbulb A. The compression-hull) A is nowfilled with the medicine or chemical to he used in the ordinary manner,when the syringe is ready for operation. Its application is similar tothat of other similar syringes. If, now, the needle should becomecorroded, broken, or damaged, it may be removed and. another needlesubstituted without damage to the other portions of the syringe. Thusthe part 0 may he an screwed from the projection N, the needle broken orrendered unfit for use may now be ZOC removed from the head V, andanother needle substituted in its stead, whereupon the parts may besecured together in the described manner and the device be ready foroperation. Of course it will be perfectly apparent that the head V maybe greatly altered, as by making the greater part of it solid andcombined with the compression-washer W; verted or otherwise changed, theessential feature being that the needle centers in line with the channelL D, and is secured in position of the elastic substance which surroundsit on account of the rotation of the piece 0. By this means it ispossible to easily adjust or remove needles, thus permitting theoperator without any serious difficulty to change so as to use needlesof different size or shape or for different purposes without dispensingwith any of the other parts of the syringe. This is a matter of someimportance in localities removed from factories whereinstruments of thischaracter can be easily made or mended, for

it permits the user to keep a supply of needles, which can be insertedwithout difficulty and without loss of time pense of sending to thefactory for repairs.

Having thus described my invention, w at claim, and desire to secure bymeans of Letters Patent, is as follows:

In a medicinal syringe, the combination of 30 the body of a syringe witha compressible packing-piece, a needle which passes through saidpacking-piece, and a compression-piece which is connected with the bodyof the syringe and partially incloses the packing, the parts 35 soconstructed and related that the needle is secured to the syringe solelyby the pressure of the compressible packing, substantially as described.

J. AUSTIN DUNN.

Witnesses:

CORA L. CADWALLADER, FRANCIS W. PARKER.

and without the ex- 2 5

